Hey all. I'm almost ready to start my new 30 gallon. The tank was a gift and was previously used for a turtle, so the water level was only about halfway up. There are a couple of scratches from rocks and such but the main problem is a serious ring of hard water stains. Any advice on how to remove them safely before I fill this baby up?
Since you mentioned the tank onced used for turtles, did you clean the tank before adding water? Any residual bacteria from the turtle tank will cause problems and kill your fish.
I use a razor blade to remove hard water stains. Do a search here and you'll find a couple posts on this subject
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1 dojo loach, 5 long finned zebra danios, 10 rosy red minnows, 5 white cloud mountain minnows, 6 ghost shrimp, 30 something red cherry shrimp, x platies, 7 swordtails, killifish, 5 normal fin zebra danios, 2 goldfish in the pond, goldfish fry, 2 koi, 5 butterfly koi, and maybe in the future some P. saulosi
Hard Water Stains
The tank was a gift and was previously used for a turtle, so the water level was only about halfway up. There are a couple of scratches from rocks and such but the main problem is a serious ring of hard water stains. Any advice on how to remove them safely before I fill this baby up? 
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